Dōjunkai (shinjitai: 同潤会, kyūjitai: 同潤會) was a corporation set up a year after the 1923 Kantō earthquake to provide reinforced concrete (and thus earthquake- and fire-resistant) collective housing in the Tokyo area. Its formal name was Zaidan-hōjin Dōjunkai (財団法人同潤会), i.e. the Dōjunkai corporation. The suffix kai means organization, and dōjun was a term coined to suggest the spread of the nutritious benefit of the water of river and sea. It was overseen by the Home Ministry.